Abstract: The boat comprises in combination two lateral canvases (8) disposed tangentially to the two compartments (6,7), and a bottom canvas (11) held under tension by a longitudinal keel (9) interposed between a floor (10) and said bottom canvas (11).

Abstract: The invention relates to a pneumatic boat of the inflatable-deflatable type capable of being propelled by a motor and comprising at least one inflatable member forming two parallel or substantially parallel arms joined at the front to form a stem-post and a rear board connecting these two arms and intended to receive or to house at least one motor, the two arms having, at least in their parallel or substantially parallel portions, a multi-lobe shaped cross section whose large axis slopes. The boat is characterized by the fact that a lateral canvas is fixed tangentially to at least some of the lobes on the outer side of the respective arm and by the fact that the slope of the large axis of the arm, the relative size of the lobes of this arm and the number of these lobes are such that the mean angle formed by this lateral canvas and the horizontal plane is between 5.degree. and 45.degree..